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arXiv 2209.09285nlin.PSphysics.optics
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强光-物质耦合系统中的亮孤子和暗孤子:精确解和数值模拟

Bright and dark solitons in the systems with strong light-matter coupling: exact solutions and numerical simulations

A. V. Yulin, D. A. Zezyulin

摘要:

我们从理论上研究了一个实验相关的混合系统中的亮孤子和暗孤子,其特征在于强光-物质耦合。我们发现,相应的两分量模型支持多种共存的运动孤子,包括零和非零背景上的亮孤子,深灰和灰-灰暗孤子。通过将两组分问题简化为一个具有五阶非线性的定常方程,得到了解析形式的解。所有发现的解决方案共存于同一组模型参数下,但在一个适当定义的线性极限,接近线性波的极化激元色散关系的不同分支。零背景亮孤子具有一个不稳定阈值,这可能与连续谱分支边缘之间的共振有关。在调制不稳定性阈值以下的宽参量范围内,“半拓扑”深灰孤子和非拓扑灰-灰孤子是稳定的,而等振幅基座上的亮孤子是不稳定的。

英文摘要:

We theoretically study bright and dark solitons in an experimentally relevant hybrid system characterized by strong light-matter coupling. We find that the corresponding two-component model supports a variety of coexisting moving solitons including bright solitons on zero and nonzero background, dark-gray and gray-gray dark solitons. The solutions are found in the analytical form by reducing the two-component problem to a single stationary equation with cubic-quintic nonlinearity. All found solutions coexist under the same set of the model parameters, but, in a properly defined linear limit, approach different branches of the polariton dispersion relation for linear waves. Bright solitons with zero background feature an oscillatory-instability threshold which can be associated with a resonance between the edges of the continuous spectrum branches. `Half-topological' dark-gray and nontopological gray-gray solitons are stable in wide parametric ranges below the modulational instability threshold, while bright solitons on the constant-amplitude pedestal are unstable.

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